BufferOverflowException when generating PDFs on WebSphere Open Liberty

#41181

Hello,

We’re experiencing an issue with PD4ML when generating PDFs on IBM Open Liberty.

Environment:

Open Liberty / WebSphere Liberty 24.0.0.2
JDK 21.0.1
Jakarta EE 10
PD4ML 4.0.17, 4.1.0, and 4.1.1 (same behavior on all versions)

Issue:
PDF generation works correctly on Tomcat but consistently fails on Open Liberty with:

java.nio.BufferOverflowException
at java.nio.HeapByteBuffer.put()
at com.ibm.ws.bytebuffer.internal.WsByteBufferImpl.put()
at com.pd4ml.taglib.jakarta.PD4MLTransformerTag.doEndTag(…)

After the failure, Liberty reports:

java.lang.IllegalStateException: SRVE0199E: OutputStream already obtained

This is a secondary error caused while rendering the error page.

What we’ve already tried:

Tested PD4ML 4.0.17, 4.1.0, and 4.1.1.
Removed custom response wrappers and GZIP filter.
Increased servlet response buffer (response.setBufferSize()).
Increased JSP page buffer.
Removed embedded TrueType fonts (<pd4ml:usettf>).
The issue only occurs on Open Liberty; the same application works correctly on Tomcat.

Do you know if this is a known compatibility issue with Open Liberty, or is there a recommended configuration or workaround?

Thank you.

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